Black 1 kills by nakade. There's no way White can make two eyes now.
If ,
makes an eye in the stomach. If White next plays a, Black b makes a rabbitty six inside White's eyespace. If White does nothing, Black will eventually atari at either a or c.
If here,
threatens to connect to the vital stone, next
almost fills with a bulky five.
Black 3 here is a mistake. turns the position into seki.
here is also wrong.
forces
and then
occupies the vital point. Next, Black a doesn't create a killing shape.
In both cases, White is able to take the vital point.
Authors: Nando, Karl Knechtel, Dieter